Re: [PATCH v2 0/2] sched_ext: Add a core event and update scx schedulers

[Tejun Heo]

On Fri, Feb 07, 2025 at 03:40:50PM +0900, Changwoo Min wrote:
> This patchset introduces a new event, SCX_EV_ENQ_SLICE_DFL, and updates
> two scx schedulers -- scx_qmap and scx_central -- to print out the new
> event.
> 
> SCX_EV_ENQ_SLICE_DFL counts how many times the tasks' time slice is set
> to the default value (SCX_SLICE_DFL) by the sched_ext core in the enqueue
> and pick_next paths.
> 
> Scheduling a task with SCX_SLICE_DFL unintentionally would be a source
> of latency spikes because SCX_SLICE_DFL is relatively long (20 msec).
> Thus, soaring the SCX_EV_ENQ_SLICE_DFL value would be a sign of BPF
> scheduler bugs, causing latency spikes.

Applied to sched_ext/for-6.15.

Thanks.

-- 
tejun